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Stashed errors used to be counted as errors, but could then be cancelled, leading to `ErrorGuaranteed` soundness holes. #120828 changed that, closing the soundness hole. But it introduced other difficulties because you sometimes have to account for pending stashed errors when making decisions about whether errors have occured/will occur and it's easy to overlook these. This commit aims for a middle ground. - Stashed errors (not warnings) are counted immediately as emitted errors, avoiding the possibility of forgetting to consider them. - The ability to cancel (or downgrade) stashed errors is eliminated, by disallowing the use of `steal_diagnostic` with errors, and introducing the more restrictive methods `try_steal_{modify,replace}_and_emit_err` that can be used instead. Other things: - `DiagnosticBuilder::stash` and `DiagCtxt::stash_diagnostic` now both return `Option<ErrorGuaranteed>`, which enables the removal of two `delayed_bug` calls and one `Ty::new_error_with_message` call. This is possible because we store error guarantees in `DiagCtxt::stashed_diagnostics`. - Storing the guarantees also saves us having to maintain a counter. - Calls to the `stashed_err_count` method are no longer necessary alongside calls to `has_errors`, which is a nice simplification, and eliminates two more `span_delayed_bug` calls and one FIXME comment. - Tests are added for three of the four fixed PRs mentioned below. - `issue-121108.rs`'s output improved slightly, omitting a non-useful error message. Fixes #121451. Fixes #121477. Fixes #121504. Fixes #121508.
10 lines
348 B
Plaintext
10 lines
348 B
Plaintext
error[E0433]: failed to resolve: use of undeclared crate or module `libc`
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--> $DIR/stashed-issue-121451.rs:1:23
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LL | extern "C" fn _f() -> libc::uintptr_t {}
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| ^^^^ use of undeclared crate or module `libc`
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0433`.
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